Move WebMouseEvent into its own header file.

third_party/WebKit/Source/web/ExternalPopupMenu.cpp

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 26 matching lines @@
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
 #include "core/html/HTMLOptionElement.h"
 #include "core/html/HTMLSelectElement.h"
 #include "core/layout/LayoutBox.h"
 #include "core/page/Page.h"
 #include "core/style/ComputedStyle.h"
 #include "platform/geometry/FloatQuad.h"
 #include "platform/geometry/IntPoint.h"
 #include "platform/text/TextDirection.h"
+#include "public/platform/WebMouseEvent.h"
 #include "public/platform/WebVector.h"
 #include "public/web/WebExternalPopupMenu.h"
 #include "public/web/WebFrameClient.h"
 #include "public/web/WebMenuItemInfo.h"
 #include "public/web/WebPopupMenuInfo.h"
 #include "web/WebLocalFrameImpl.h"
 #include "web/WebViewImpl.h"
 #include "wtf/PtrUtil.h"
 
 namespace blink {
@@ skipping 244 matching lines @@
     if (ownerElement.itemIsDisplayNone(*items[i]))
       continue;
     if (popupMenuItemIndex == i)
       return indexTracker;
     ++indexTracker;
   }
   return -1;
 }
 
 }  // namespace blink